When is engine starting J3 bypasses the ballast because system voltage is already low, and if anything starting requires more spark energy than running.
Starting sequence illustrated here
11 Volts during starting is good.
9.5 Volts at the battery during start is generally considered the minimum.
Once the coil has developed its max energy level, any additional current flowing though is just generating waste heat. This can damage the coil. HEI has a current controller. The Ford Duraspark and Chrysler ECU regulated current by controlling voltage.